Circuit layout method

Abstract

A method includes identifying fingers of a first device and fingers of a second device. The method includes grouping the fingers of the first device into a first finger group and a second finger group, wherein the first finger group is electrically connected to the second finger group. The method further includes positioning the first finger group extends across a first doped region. The method further includes positioning the second finger group extends across a second doped region, wherein the second doped region has a same dopant type as the first doped region. The method further includes grouping the fingers of the second device into a third finger group and a fourth finger group, wherein the third finger group is electrically connected to the fourth finger group. The method further includes positioning the third finger group and the fourth finger group extending across the second doped region.

What is claimed is: 
     
       1. A method comprising:
 identifying fingers of a first device; 
 grouping the fingers of the first device into a first finger group and a second finger group, wherein the first finger group is electrically connected to the second finger group; 
 positioning the first finger group extends across a first doped region; 
 positioning the second finger group extends across a second doped region, wherein the second doped region has a same dopant type as the first doped region; 
 identifying fingers of a second device, wherein the second device has a different number of fingers from the first device; 
 grouping the fingers of the second device into a third finger group and a fourth finger group, wherein the third finger group is electrically connected to the fourth finger group; and 
 positioning the third finger group and the fourth finger group extending across the second doped region, wherein a number of finger groups extending across the first doped region is different from a number of finger groups extending across the second doped region, and each of the finger groups extending across the first doped region and each of the finger groups extending across the second doped region comprises a plurality of fingers. 
 
     
     
       2. The method of  claim 1 , wherein positioning the second finger group comprises positioning the second finger group extending across the second doped region physically separated from the first doped region. 
     
     
       3. The method of  claim 1 , wherein positioning the second finger group comprises positioning the second finger group between the third finger group and the fourth finger group. 
     
     
       4. The method of  claim 1 , further comprising receiving a circuit design. 
     
     
       5. The method of  claim 4 , wherein identifying the fingers of the first device comprises identifying the fingers of the first device based on the received circuit design. 
     
     
       6. The method of  claim 4 , wherein identifying the fingers of the second device comprises identifying the fingers of the second device based on the received circuit design. 
     
     
       7. The method of  claim 1 , further comprising:
 identifying fingers of a third device; 
 grouping the fingers of the third device into a fifth finger group; and 
 positioning the fifth finger group extending across the second doped region. 
 
     
     
       8. The method of  claim 7 , wherein positioning the fifth finger group comprises positioning the fifth finger group adjacent to the third finger group. 
     
     
       9. The method of  claim 1 , wherein positioning the first finger group comprises positioning the first finger group extending across a third doped region, wherein the third doped region has an opposite dopant type from the first doped region. 
     
     
       10. The method of  claim 1 , wherein positioning the second finger group comprises positioning the second finger group extending across a third doped region, wherein the third doped region has an opposite dopant type from the second doped region. 
     
     
       11. A method comprising:
 receiving a circuit design, wherein the circuit design comprises a first device and a second device; 
 identifying fingers of the first device, wherein each finger of the fingers of the first device are electrically connected together; 
 identifying fingers of the second device, wherein each finger of the fingers of the second device are electrically connected together, and the second device has a different number of fingers from the first device; 
 repositioning a first finger group of the fingers of the first device from a first position to a second position, wherein the repositioned first finger group extends across a first doped region; and 
 repositioning a second finger group of the fingers of the first device from a third position to a fourth position, wherein the repositioned second finger group extends across a second doped region having a same dopant type as the first doped region, the repositioned second finger group is between a third finger group of the fingers of the second device and a fourth finger group of the fingers of the second device, a number of finger groups extending across the first doped region is different from a number of finger groups extending across the second doped region, and each of the finger groups extending across the first doped region and each of the finger groups extending across the second doped region comprises a plurality of fingers. 
 
     
     
       12. The method of  claim 11 , further comprising repositioning the third finger group from a fifth position to a sixth position. 
     
     
       13. The method of  claim 11 , wherein repositioning the second finger group comprises repositioning the second finger group such that a number of finger groups extending across the first doped region is different from a number of finger groups extending across the second doped region. 
     
     
       14. The method of  claim 11 , wherein repositioning the second finger group comprises repositioning the second finger group extending across the second doped region physically separated from the first doped region. 
     
     
       15. The method of  claim 11 , wherein repositioning the first finger group comprises repositioning the first finger group extending across a third doped region, wherein the third doped region has an opposite dopant type from the first doped region. 
     
     
       16. The method of  claim 11 , wherein repositioning the second finger group comprises repositioning the second finger group extending across a third doped region, wherein the third doped region has an opposite dopant type from the second doped region. 
     
     
       17. A method comprising:
 receiving a circuit design, wherein the circuit design comprises a first device and a second device, the first device has a first finger group at a first position and a second finger group at a second position, the first finger group is electrically connected to the second finger group, the second device has a third finger group and a fourth finger group, the third finger group is electrically connected to the fourth finger group, the second device has a different number of fingers from the first device, and a number of fingers in each of the first finger group, the second finger group, the third finger group and the fourth finger group is equal; 
 repositioning the first finger group from the first position to a third position, wherein the repositioned first finger group extends across a first doped region and a second doped region, and the first doped region has an opposite dopant type from the second doped region; and 
 repositioning the second finger group from the second position to a fourth position, wherein the repositioned second finger group extends across a third doped region having a same dopant type as the first doped region and across a fourth doped region having a same dopant type as the second doped region, the third doped region is physically separate from the first doped region, the fourth doped region is physically separate from the second doped region, a number of finger groups extending across the first doped region is different from a number of finger groups extending across the third doped region, and each of the finger groups extending across the first doped region and each of the finger groups extending across the third doped region comprises a plurality of fingers. 
 
     
     
       18. The method of  claim 17 , wherein repositioning the second finger group comprises repositioning second finger group to be between the third finger group and the fourth finger group. 
     
     
       19. The method of  claim 17 , wherein receiving the circuit design comprises receiving the circuit design. 
     
     
       20. The method of  claim 17 , wherein repositioning the first finger group comprises repositioning the first finger group to be adjacent to a finger group of a third device of the circuit design.